NUAIRE’S MVHR
Acoustic solution for
MRXBOX95(AB)-WH1 and
MRXBOX95(AB)-WM2
Nuaire’s First Fix and Acoustic Solution are designed to
not only reduce noise but to improve the installation
when wall or cupboard mounting the MRXBOX95(AB)WH1 and MRXBOX95(AB)-WM2 Units.
Offering the only complete MVHR acoustic and first fix solution to
overcome both noise and ease the installation of heat recovery units.
Nuaire’s solution addresses both duct and breakout noise, provides an
aesthetically pleasing cupboard installation for the home occupant and
reduces installation errors and time.
These units are also available in Opposite Handed format.
Typical Installation
FIRST FIX SOLUTION FF-WH1/FF-WM2
Nuaire’s First Fix box is fixed
to the underside of the floor
slab at first fix stage of the build.
The box has four airflow
chambers with optional positions
MRXBOX-FF-WH1
for 204x60mm spigots. Ceilings
can then be boarded within the cupboard space easily and
quickly without the risk of the spigots not aligning to the fan unit.
SILENCER SIL-WH1/SIL-WM2
Nuaire has created a unique solution that is not only designed to
reduce noise significantly, addressing duct and breakout noise,
but is visibly appealing for the home occupant. It can be used
with or without the First Fix Solution.
MRXBOX95(AB)-WH1/ MRXBOX95(AB)- WM2
Nuaire’s Silencer and First Fix solution are compatible with the
MRXBOX95(AB)-WH1 and MRXBOX95(AB)-WM2 heat recovery
units, which are designed for medium to large properties.
10
Acoustic data for MRXBOX95(AB)-WH1
with Silencer and/or First Fix
WH1 with SIL Sound Data
Curve
Max. Power/W
1
150
WH1 with FF Sound Data
Curve
150
WH1 with FF & SIL Sound Data
150
125
250
500
1K
2K
4K
8K
dBA
@3m
Sound power levels dB re 1pW
40
45
56
41
53
61
49
58
59
39
53
53
25
39
43
<16
34
40
<16
30
25
<16
26
16
Frequency/Hz
63
125
250
500
1K
2K
4K
8K
37
dBA
@3m
Sound power levels dB re 1pW
Open Inlet
Open Outlet
Breakout
44
48
56
44
58
61
53
63
59
43
60
53
40
55
43
32
53
40
19
44
25
<16
35
16
Frequency/Hz
63
125
250
500
1K
2K
4K
8K
33
42
53
25
32
43
<16
25
40
<16
22
25
<16
<16
16
Max. Power/W
1
63
Open Inlet
Open Outlet
Breakout
Max. Power/W
1
Curve
Frequency/Hz
37
dBA
@3m
Sound power levels dB re 1pW
Open Inlet
Open Outlet
Breakout
36
38
56
31
45
61
43
49
59
37
The breakout case-radiated dBA values are given for Hemispherical free field radiation at 3m – to obtain the spherical radiated data, subtract 3dBA.
Silencer Corrections
SIL Corrections
FF Corrections
FF+SIL Corrections
Open Inlet
-8
-10
-9
-10
-22
-24
-16
-13
Open Outlet
-11
-10
-9
-14
-23
-26
-20
-15
Breakout
0
0
0
0
0
0
0
0
Open Inlet
-4
-7
-5
-6
-7
-7
-6
-4
Open Outlet
-8
-5
-4
-7
-7
-7
-6
-6
Breakout
0
0
0
0
0
0
0
0
Open Inlet
-12
-20
-15
-16
-22
-24
-19
-16
Open Outlet
-18
-18
-18
-25
-30
-35
-28
-26
Breakout
0
0
0
0
0
0
0
0
11
NUAIRE’S MVHR
Technical
DIMENSIONS (mm) for WH1 unit
SIL-WH1
655
TOP VIEW
445
SIDE VIEW
458 CRS
=
=
FF-WH1
=
227 CRS
432
=
Ø150
FRONT/REAR VIEW
400
=
=
=
=
204 x 60
666
TOP VIEW
458 CRS
=
=
SIDE VIEW
=
=
242 CRS
=
227 CRS
Ø150
155
489
107
=
110
FACE TO BE MOUNTED
NEAREST TO WALL
30
COMPLETED SYSTEM
SIDE VIEW
CROSS BRACE
=
=
672
12
1132
66
648
965
1110
462
167
TOP VIEW
ADJUSTABLE FEET
WALL/SOLID STRUCTURE
ANGLE BRACKET
Consultants Specification
SIL-WH1
OPERATION
The unit offers the facility to be fitted directly to the MVHR unit and
plenum chamber without the need for spigots reducing breakout noise.
However, there is the capability to fit 150mm circular spigots as an
alternative option.
The supply and extract ventilation unit shall be positioned as indicated
on the drawings and shall be in accordance with the particular fan
schedule in the specification. This unit is also available in Opposite
Hand formatting.
The unit shall be fully lined with acoustic material offering excellent
noise reduction.
The combined supply and extract with heat recovery unit, shall supply
filtered fresh air to each of the habitable rooms and vitiated air shall be
extracted from the wet areas e.g. bathroom, en-suite, w.c, kitchen, utility
rooms, etc. The supply air shall be pre-heated by the warm extract air via
the integrated counter-flow heat exchanger element. The extracted air
shall also be filtered before it reaches the heat exchanger block.
Wall mounting brackets are to be supplied as part of the system to
allow the MVHR unit to be raised after other system components are
installed to form an airtight seal and enable the installation to
be levelled.
The unit shall be clamped to the MRXBOX95(AB)-WH1 unit to provide
an efficient seal and ensure correct alignment.
The unit shall be fixed in position during installation as a standalone
section without relying on other system elements.
FF- WH1
The unit shall be supplied with 204mm x 60mm rectangular spigots to
connect to the duct run, with the ability to be fitted in eight separate
positions reducing the requirement for bends in the system.
The unit offers the facility to be fitted directly to the mating sections
without the need for spigots reducing breakout noise, additional
150mm circular spigots to be supplied as an alternative option.
TECHNICAL DATA
Units shall be one of MRXBOX95AB-WH1, MRXBOX95-WH1,
MRXBOX95AB-WH1-OH, MRXBOX95-WH1-OH as manufactured
by Nuaire.
SPECIFICATION
The unit shall be fully insulated providing excellent thermal and
acoustic characteristics and shall be complete with a multi plate
counter flow high efficiency heat exchanger block, with a thermal
efficiency of up to 95%. The heat exchanger shall be protected by G3
grade filters on fresh air inlet and system extract. The heat exchanger
and filters shall be accessible via the front access panel, enabling quick
and easy maintenance.
The unit shall have low energy, high efficiency EC fan/motor
assemblies with sealed for life bearings, the impellers shall be backward
curved centrifugal type. The motors shall be suitable of an ambient
temperature of 40°C.
The unit shall be supplied complete with a condensate drip tray and
21.5mm drain connection.
The ventilation unit shall vary its speed and therefore the ventilation
rate, as it receives signals from the switched live signal from light/
remote switches or any ancillary sensors. When signals are received, the
fan shall alter its speed to adjustable, normal and boost rates.
The unit shall have the facility to commission the supply and extract
fans independently on minimum speed (continuous background
ventilation), and boost speed, via inbuilt minimum and maximum
speed adjustment. The fans shall have infinitely variable speed control.
INTEGRAL AUTOMATIC SUMMER BYPASS
(MRXBOX95AB-WH1 & MRXBOX95AB-WH1-OH only)
Including Automatic SUMMER BYPASS where intake and return air
temperatures shall be measured so that supply air temperatures can be
maximised during winter months and minimised as external ambient
temperature rises. The Summer Bypass damper shall be opened by a
wax actuator. Supply and Extract air shall be filtered irrespective of the
bypass setting (open or closed).
CONTROL OPTIONS
All versions shall have the following functions integrally mounted
within the fan unit on a purpose made PCB, all such components prewired and factory fitted by the manufacturer:
• Independent control of background supply and extract flow rates
• Independent control of boost speed supply and extract flow rates
• Integral fan failure indication
• Integral S/L terminal for boost from remote switch, e.g. light switch,
kitchen boost switch
• Integral heat exchanger frost protection
• Discreet daily run monitor.
• Integral humidistat.
OPTIONAL CONTROLS
MRXBOX95-RFI Remote fail indicator.
The unit shall be suitable for 150mm diameter circular ducting.
MRXBOX95-PIR (Passive Infra-Red) A low voltage sensor which detects
movement and activates system.
The breakout noise level and power requirements shall be as detailed
by the unit manufacturer and in accordance with the ventilation
equipment schedule.
MRXBOX95-HUM A low voltage sensor which activates the system
when the relative humidity level is above a set point.
The unit shall be offered with a 5 year warranty.
MRXBOX-VSC An LCD controller for MVHR system with a 3.2” touch
screen display.
13
NUAIRE’S MVHR
Acoustic data for MRXBOX95(AB)-WM2
with Silencer and/or First Fix
WM2 with SIL Sound Data
Curve
Max. Power/W
1
150
WM2 with FF Sound Data
Curve
150
WM2 with FF & SIL Sound Data
150
125
250
500
1K
2K
4K
8K
Open Inlet
Open Outlet
Breakout
49
44
61
47
55
61
52
62
56
46
53
53
28
41
47
23
34
44
20
31
35
21
28
33
Frequency/Hz
63
125
250
500
1K
2K
4K
8K
53
47
61
50
60
61
56
67
56
50
60
53
43
57
47
40
53
44
30
45
35
30
37
33
Frequency/Hz
63
125
250
500
1K
2K
4K
8K
40
42
53
28
34
47
<16
25
44
<16
23
35
<16
17
33
45
37
61
37
47
61
46
53
Silencer Corrections
FF Corrections
FF+SIL Corrections
14
37
dBA
@3m
37
dBA
@3m
Sound power levels dB re 1pW
Open Inlet
Open Outlet
Breakout
The breakout case-radiated dBA values are given for Hemispherical free field radiation at 3m – to obtain the spherical radiated data, subtract 3dBA.
SIL Corrections
dBA
@3m
Sound power levels dB re 1pW
Open Inlet
Open Outlet
Breakout
Max. Power/W
1
63
Sound power levels dB re 1pW
Max. Power/W
1
Curve
Frequency/Hz
Open Inlet
-8
-10
-9
-10
-22
-24
-16
-13
Open Outlet
-11
-10
-9
-14
-23
-26
-20
-15
Breakout
0
0
0
0
0
0
0
0
Open Inlet
-4
-7
-5
-6
-7
-7
-6
-4
Open Outlet
-8
-5
-4
-7
-7
-7
-6
-6
Breakout
0
0
0
0
0
0
0
0
Open Inlet
-12
-20
-15
-16
-22
-24
-19
-16
Open Outlet
-18
-18
-18
-25
-30
-35
-28
-26
Breakout
0
0
0
0
0
0
0
0
37
Technical
DIMENSIONS (mm) for WM2 unit
605
SIL-WM2
TOP VIEW
=
SIDE VIEW
=
=
Ø125
=
172 CRS
353
445
417 CRS
400
FF-WM2
=
=
=
=
FRONT/REAR VIEW
204 x 60
670
TOP VIEW
110
417 CRS
=
=
=
=
=
242 CRS
172 CRS
Ø125
220
489
97
=
SIDE VIEW
FACE TO BE MOUNTED
NEAREST TO WALL
COMPLETED SYSTEM
CROSS BRACE
=
=
1001
ADJUSTABLE FEET
ANGLE BRACKET
626
66
519
834
979
461
Wall Mounting
Bracket
167
30
SIDE VIEW
TOP VIEW
WALL/SOLID STRUCTURE
15
Consultants Specification
SIL- WM2
OPERATION
The unit offers the facility to be fitted directly to the MVHR unit and
plenum chamber without the need for spigots reducing breakout noise.
However, there is the capability to fit 125mm circular spigots as an
alternative option.
The supply and extract ventilation unit shall be positioned as indicated
on the drawings and shall be in accordance with the particular fan
schedule in the specification. This unit is also available in Opposite
Hand formatting.
The unit shall be fully lined with acoustic material offering excellent
noise reduction.
The combined supply and extract with heat recovery unit, shall supply
filtered fresh air to each of the habitable rooms and vitiated air shall be
extracted from the wet areas e.g. bathroom, en-suite, w.c, kitchen, utility
rooms, etc. The supply air shall be pre-heated by the warm extract air via
the integrated counter-flow heat exchanger element. The extracted air
shall also be filtered before it reaches the heat exchanger block.
Wall mounting brackets are to be supplied as part of the system to
allow the MVHR unit to be raised after other system components are
installed to form an airtight seal and enable the installation to
be levelled.
The unit shall be clamped to the MRXBOX95(AB)-WM2 unit to provide
an efficient seal and ensure correct alignment.
The unit shall be fixed in position during installation as a standalone
section without relying on other system elements.
FF-WM2
The unit shall be supplied with 204mm x 60mm rectangular spigots to
connect to the duct run, with the ability to be fitted in eight separate
positions reducing the requirement for bends in the system.
The unit offers the facility to be fitted directly to the mating sections
without the need for spigots reducing breakout noise, additional
125mm circular spigots to be supplied as an alternative option.
TECHNICAL DATA
Units shall be one of MRXBOX95AB-WM2, MRXBOX95-WM2,
MRXBOX95AB-WM2-OH, MRXBOX95-WM2-OH as manufactured
by Nuaire.
SPECIFICATION
The unit shall be fully insulated providing excellent thermal and
acoustic characteristics and shall be complete with a multi plate
counter flow high efficiency heat exchanger block, with a thermal
efficiency of up to 95%. The heat exchanger shall be protected by G3
grade filters on fresh air inlet and system extract. The heat exchanger
and filters shall be accessible via the front access panel, enabling quick
and easy maintenance.
The unit shall have low energy, high efficiency EC fan/motor
assemblies with sealed for life bearings, the impellers shall be backward
curved centrifugal type. The motors shall be suitable of an ambient
temperature of 40°C.
The unit shall be supplied complete with a condensate drip tray and
21.5mm drain connection.
The unit shall be suitable for 125mm diameter circular ducting.
The breakout noise level and power requirements shall be as detailed
by the unit manufacturer and in accordance with the ventilation
equipment schedule.
The unit shall be offered with a 5 year warranty.
16
The ventilation unit shall vary its speed and therefore the ventilation
rate, as it receives signals from the switched live signal from light/
remote switches or any ancillary sensors. When signals are received, the
fan shall alter its speed to adjustable, normal and boost rates.
The unit shall have the facility to commission the supply and extract
fans independently on minimum speed (continuous background
ventilation), and boost speed, via inbuilt minimum and maximum
speed adjustment. The fans shall have infinitely variable speed control.
INTEGRAL AUTOMATIC SUMMER BYPASS
(MRXBOX95AB-WM2 & MRXBOX95AB-WM2-OH only)
Including Automatic SUMMER BYPASS where intake and return air
temperatures shall be measured so that supply air temperatures can be
maximised during winter months and minimised as external ambient
temperature rises. The Summer Bypass damper shall be opened by a
wax actuator. Supply and Extract air shall be filtered irrespective of the
bypass setting (open or closed).
CONTROL OPTIONS
All versions shall have the following functions integrally mounted
within the fan unit on a purpose made PCB, all such components prewired and factory fitted by the manufacturer:
• Independent control of background supply and extract flow rates
• Independent control of boost speed supply and extract flow rates
• Integral fan failure indication
• Integral S/L terminal for boost from remote switch, e.g. light switch,
kitchen boost switch
• Integral heat exchanger frost protection
• Discreet daily run monitor.
• Integral humidistat.
OPTIONAL CONTROLS
MRXBOX95-RFI Remote fail indicator.
MRXBOX95-PIR (Passive Infra-Red) A low voltage sensor which detects
movement and activates system.
MRXBOX95-HUM A low voltage sensor which activates the system
when the relative humidity level is above a set point.
MRXBOX-VSC An LCD controller for MVHR system with a 3.2” touch
screen display.